临兴区块致密砂岩储层录测综合评价方法研究

A comprehensive evaluation method of tight sandstone reservoirs in Linxing Block

致密油气层的开发需要以储层评价为基础,但目前尚无一套评价方法能够立足于实际。以鄂尔多斯盆地临兴区块石盒子组致密储层为例,运用综合录井和测井手段获取气测、元素、矿物组分含量及常规测井曲线,首先,利用气测及气测衍生参数划定储层含气性标准;其次,基于现场录测数据,采用矿物元素组分、回归拟合方法计算地层脆性指数;最后,基于含气性指标和脆性指标,通过归一化的方法,建立储层录测综合评价标准。结果表明,基于致密砂岩储层录测5参数建立的综合评价标准EI能够为后期压裂改造提供储层评价的理论依据。

A good evaluation method is necessary for tight gas reservoir development.However,there is no one suitable for reality at present.Taking the tight reservoir of Shihezi Formation in Linxing Block of Ordos Basin as an example,gas logging,element,mineral component content and conventional logging curves are obtained by using mud logging and wireline.First of all,gas logging and its derived parameters are used to delimit the gas bearing standard.Secondly,based on the field logging data,the mineral element composition and regression fitting method are used to calculate the formation brittleness index.Finally,based on gas bearing and brittleness indexes,a comprehensive evaluation for reservoir logging is established by normalization method.The results show that the comprehensive evaluation standard EI standard based on 5 parameters of tight sandstone reservoir logging can provide a good basis on theory for later fracturing reconstruction.